Micro PMU


The microPMU is like microscope for grid; used for study and understands the complex and dynamic power flows in distribution grids and microgrids. It measures phase angle 0.002° and 2 ppm magnitude resolution.

  • A well fit for research/study how DER affects grid stability. 
  • for measuring cable impedances for precise fault locations
  • for verifying and improving distribution system models
  • detection of cyber attacks or rehearsals of it on substations
  • DER/load characterization


  • 0,001° resolution on voltage and current phase angles, 2 PPM resolution on voltage and current magnitudes (short term).
  • Connects directly to any world‐wide power grid voltage: 16.67/50/60/400 Hz, 100V ~ 690V, single‐phase or three‐phase.
  • Fully supports PT’s (up to 100kV) and CT’s (up to 6 000 amps)
  • Ethernet connection – HTTP web page, FTP file downloads and uploads, IEEE C37.118 streaming
  • Fully compatible with OpenPDC, the standard phasor data concentrator software.
  • Reference instrument for University of California at Berkeley’s Quasar synchrophasor research software, optimized for synchrophasor research on distribution and microgrids.
  • Built‐in instrument power for 24‐48VDC, 24VAC, and Power‐over‐Ethernet, with 10‐second supercapacitor backup. Optional plug‐in modules for 100V‐240V power, 30‐minute UPS.
  • 3 voltage and 3 current angle‐magnitude pairs reported 2 times per cycle (100/sec at 50 Hz, 120/sec at 60 Hz)
  • Measurement data is recorded in on‐board 30 day buffer – tolerates complete loss of communication channel with no loss of research data
  • Patent‐pending calibrated GPS antenna/receiver is fully electrically isolated for safety – absolutely no electrical connection between GPS antenna/receiver and PQube 3 MicroPMU. Cable is entirely digital, so length is not important.
  • Tiny PQube 3 footprint. Can be snapped into electrical panels, distribution poles, pad‐mount transformers
  • UL Listed, CE‐marked, fully certified for emissions and immunity, temperature stability, and more.
  • Platform is 100% compatible with Class A Power Quality recorder, Class 0.2% Energy recorder – just upload firmware.

U.S. Govt. ARPA-E research project on Micro-Synchrophasor

Award no DE-AR00000340

The U.S. Department of Energy's ARPA‐E project is a 3 year, US$4 million effort by Power Sensors Ltd, CIEE, Lawrence Berkeley National Lab and the University of California at Berkeley. 

The project is installing about 100 PQube 3 MicroPMU’s at LBNL’s substations and U.S. utility distribution grids.  Every day, several gigabytes of research data flows from the MicroPMU’s to a server at UC Berkeley, where an astonishing new open‐source software package called Quasar makes the data available to researchers through a web interface. 

Researchers use measurements from the PQube 3 MicroPMU to investigate grid impedances, grid stability, synchronized measurements of wide‐ area voltage disturbances, grid model verification, and other useful topics.